<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒子模型之边框</title>
    <style>
        div {
            width: 800px;
            height: 400px;
            /* border-width 边框粗细，一般情况用px */
            border-width: 5px;
            /* border-style 边框的样式 solid 实线边框 dashed 虚线边框 dotted 点线边框*/
            /* border-style: solid; */
            /* border-style: dashed; */
            border-style: dotted;
            /* border-color 边框颜色 */
            border-color: aqua;
        }
    </style>
</head>
<body>
    <div><img src="img/盒子模型边框示例.png" alt=""></div>
</body>
</html>